Regensburg 2000 – wissenschaftliches Programm

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AM: Magnetismus

AM 13: Postersitzung: Dünne Schichten (1–22), Magnetowiderstand (23–40), Phasenübergänge (41–55), Mikromagnetismus (56–68), Spektroskopie (69–77), Nanokristalline Materialien (78–82), Anisotropie (83–86), Schmelzen (87–90), Weitere Bereiche (91–100)

AM 13.82: Poster

Dienstag, 28. März 2000, 16:00–20:00, A

Magnetic properties of GdSi films — •Oleg Krupin¹, Franziskus Heigl¹, Günter Kaindl¹, Kai Starke¹, and Sergueji Gorovikov² — ¹Fachbereich Physik, Freie Universität Berlin — ²Sate University of St. Petersburg, Russia

With the discovery of a ’giant’ magnetocaloric effect, compounds of gadolinium (Gd) with elements of the Si group have recently attracted considerable interest. Here we report the first study of 10 ... 20  nm thick   Gd_xSi_y films, which were prepared by simultaneous vacuum deposition of both elements (’coevaporation’) onto a cold W(110) substrate held at 30   K. The film stochiometry, monitored by Auger spectroscopy, was varied from dilute Si to nearly   GdSi₂. For stochiometries near   Gd₅Si₃ we observe, using alternating-current magneto-optical Kerr effect (AC-MOKE) in the visible-light regime, ordering temperatures between ∼ 150   K and ∼ 190   K. The films show a much higher magnetic susceptibility as compared to Gd-metal films, and a remarkable thermal stability: they break up into islands only above 550  ^∘C.